springboot 使用scala 开发

需要主要的，现在的springboot 的版本是2.0.5 release ，之前都是1.× ，不过大同小异，

springboot 本身是支持 java 8 kotlin groovy，大家也可以尝试一下 kotlin ，kotlin 以后可能会崛起

说一下打包部署
正常来说我们做java 都会打个jar包 部署到生产环境上，
springboot 据说他打包的文件生成方式和普通的 是有差别的，确实，我点击jar 解压看到的和普通有很大差别，所以才会有一个 springboot-maven-plugin
有了这个插件所以 springboot部署成jar包比较简单
但是吧 springboot对sbt 没有特殊支持 也没有这个插件，我耗费三体还是没有实现主就是报这个错

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.

那我们说 springboot sbt scala 部署到底如何实现呢
其实在不打jar 包的情况下还是有多种实现的，比如 git 整个项目到生产环境，直接sbt run 就可以启动整个项目
，另外还要说一下，springboot如果不启动web ，比如做定时任务，使用sbt-assembly插件 其实打成jar包也是可以使用的
还有一种就是是使用sbt-native-package插件，这个插件超级强大，简直可以用震惊！！！，他娘的，什么都可以打包，就是打不成jar包，rpm docker image zip tar.gz
macos dmg win exe,这些他都可以

logLevel := Level.Warn
addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.6")
//addSbtPlugin("org.scala-sbt.plugins" % "sbt-onejar" % "0.9.7")
addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.3.10")
//addSbtPlugin("org.ensime" % "sbt-ensime" % "1.12.14")

I solved the issue by moving to sbt-native-packager

plugins.sbt
addSbtPlugin("com.typesafe.sbt" % "sbt-native-packager" % "1.2.0")
build.sbt
scriptClasspath := Seq("*")
mainClass in Compile := Some("com.x.app.XETL")
enablePlugins(JavaAppPackaging)
Running:
packaging sbt universal:stage
starting the app: target\universal\stage\bin\x.bat

这个会生产一个脚本，直接执行这个脚本就可以，不过有时候也会失败，这个需要在

对于 maven scala springboot 项目来说，要想打成jar包运行，必须包含其中的两个maven 插件，缺一个也不行

<build>
        <sourceDirectory>src/main/scala</sourceDirectory>
        <testSourceDirectory>src/test/scala</testSourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.scala-tools</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <recompileMode>incremental</recompileMode>
                    <scalaVersion>${scala.version}</scalaVersion>
                    <launchers>
                        <launcher>
                            <id>app</id>
                            <mainClass>com.tz.app.tzApplication</mainClass>
                            <args>
                                <arg>-deprecation</arg>
                            </args>
                            <jvmArgs>
                                <jvmArg>-Xms64m</jvmArg>
                                <jvmArg>-Xmx1024m</jvmArg>
                            </jvmArgs>
                        </launcher>
                    </launchers>
                </configuration>
                <dependencies>
                    <!-- spring热部署-->
                    <dependency>
                        <groupId>org.springframework</groupId>
                        <artifactId>springloaded</artifactId>
                        <version>1.2.6.RELEASE</version>
                    </dependency>
                </dependencies>
            </plugin>

            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <!--<configuration>-->
                <!--<fork>true</fork>&lt;!&ndash; 如果没有该项配置，肯呢个devtools不会起作用，即应用不会restart &ndash;&gt;-->
                <!--</configuration>-->
            </plugin>

完整的

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" 
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xiecheng</groupId>
    <artifactId>spring-scala</artifactId>
    <version>0.2</version>
    <packaging>jar</packaging>

    <name>spring-scala</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        
        
        <start-class>com.tz.app.tzApplication</start-class>
        <java.version>1.8</java.version>
        <scala.version>2.11.7</scala.version>
        <platform-bom.version>2.0.5.RELEASE</platform-bom.version>
        <spring-boot-starter-bom.version>2.0.5.RELEASE</spring-boot-starter-bom.version>
        <spring-boot.version>2.0.5.RELEASE</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>io.projectreactor</groupId>
            <artifactId>reactor-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <!--<dependency>-->
            
            <!--<artifactId>common-files</artifactId>-->
            <!--<version>0.0.1-SNAPSHOT</version>-->
        <!--</dependency>-->
    </dependencies>
    <build>
        <sourceDirectory>src/main/scala</sourceDirectory>
        <testSourceDirectory>src/test/scala</testSourceDirectory>
        <plugins>
            <plugin>
                <groupId>org.scala-tools</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <recompileMode>incremental</recompileMode>
                    <scalaVersion>${scala.version}</scalaVersion>
                    <launchers>
                        <launcher>
                            <id>app</id>
                            <mainClass>com.tz.app.tzApplication</mainClass>
                            <args>
                                <arg>-deprecation</arg>
                            </args>
                            <jvmArgs>
                                <jvmArg>-Xms64m</jvmArg>
                                <jvmArg>-Xmx1024m</jvmArg>
                            </jvmArgs>
                        </launcher>
                    </launchers>
                </configuration>
                <dependencies>
                    <!-- spring热部署-->
                    <dependency>
                        <groupId>org.springframework</groupId>
                        <artifactId>springloaded</artifactId>
                        <version>1.2.6.RELEASE</version>
                    </dependency>
                </dependencies>
            </plugin>

            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <!--<configuration>-->
                <!--<fork>true</fork>&lt;!&ndash; 如果没有该项配置，肯呢个devtools不会起作用，即应用不会restart &ndash;&gt;-->
                <!--</configuration>-->
            </plugin>


            <!--<plugin>-->
                <!--<groupId>org.apache.maven.plugins</groupId>-->
                <!--<artifactId>maven-dependency-plugin</artifactId>-->
                <!--<executions>-->
                    <!--<execution>-->
                        <!--<phase>package</phase>-->
                        <!--<goals>-->
                            <!--<goal>copy-dependencies</goal>-->
                        <!--</goals>-->
                    <!--</execution>-->
                <!--</executions>-->
                <!--<configuration>-->
                    <!--<includeScope>system</includeScope>-->
                <!--</configuration>-->
            <!--</plugin>-->

        </plugins>
    </build>
    <reporting>
        <plugins>
            <plugin>
                <groupId>org.scala-tools</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <configuration>
                    <scalaVersion>${scala.version}</scalaVersion>
                </configuration>
            </plugin>
        </plugins>
    </reporting>

    <repositories>
        <repository>
            <id>scala-tools.org</id>
            <name>Scala-Tools Maven2 Repository</name>
            <url>http://scala-tools.org/repo-releases</url>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>scala-tools.org</id>
            <name>Scala-Tools Maven2 Repository</name>
            <url>http://scala-tools.org/repo-releases</url>
        </pluginRepository>
    </pluginRepositories>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>io.spring.platform</groupId>
                <artifactId>platform-bom</artifactId>
                <version>${platform-bom.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>



</project>

在 IDEA 里面新建 SpringBoot 启动配置，运行后启动成功。
在 POM 目录 执行 mvn spring-boot:run 运行项目，启动成功；
线下环境 通过 java -jar jar_name.jar，运行成功；

用下面命令重新打包试试看

mvn clean package spring-boot:repackage -Dmaven.test.skip

在sbt 中
这两个是罪魁祸首

//libraryDependencies += "org.springframework" % "spring-webflux" % "5.1.1.RELEASE"
////libraryDependencies += "org.springframework.boot" % "spring-boot-starter-actuator" % "2.0.5.RELEASE"

一引用就出问题